采用土工膜斜墙防渗的土堤坝稳定性研究

Stability study on soil dam and levees adopting inclined geomembrane wall as seepage control structure

采用土工膜斜墙防渗的土堤坝,最薄弱的部位是土工膜的上下两个界面,稳定破坏形式通常是沿界面的平移滑动。建立了土工膜斜墙防渗土堤坝抗滑稳定的计算模型,并以某水库为例进行了计算分析,主要考虑了土堤坝坡度、地震烈度、保护层形式对抗滑稳定的影响。研究结果表明,对已建水库的除险加固工程,放缓边坡、增设压重平台、增大土工膜与接触材料间的摩擦系数都是有效的加固途径;坡比和地震烈度是影响坝坡稳定的最主要因素。研究结果可为采用土工膜斜墙防渗的土堤坝设计及除险加固提供有益的参考。

For levee and soil dam adopting inclined geomembrane wall as seepage control structure,the most unsubstantial part are the upper and lower interfaces of the geomembrane,along which the slope sliding is likely to happen.We establish a calculation model for stability analysis of embankment with geomembrane.Taking a dam as an example,we conduct a stability analysis using this model,considering influence of slope gradient,earthquake intensity and protection layer form.The results reveal that,for reinforcement work of the built dams,the effective reinforcement measures involve gradient reduction,arranging weight platform,increasing friction ratio between geomembrane and contact materials;slope gradient and earthquake intensity are the most influential factors for stability of slope.The results provide a reference for design and reinforcement of embankment and levees which adopt inclined geomembrane wall as seepage control structures.